Dual drain path for washing machine appliances

ABSTRACT

A washing machine appliance includes a cabinet, a wash tub positioned within the cabinet, at least one pump in fluid communication with the wash tub, and a dual drain path connected to the at least one pump. The dual drain path may include a first drain path from the at least one pump, an unfiltered second drain path from the at least one pump in fluid parallel to the first drain path, and a water filter located along the first drain path. Some washing machine appliances may further include a controller configured to initiate a drain cycle.

FIELD OF THE INVENTION

The present subject matter relates generally to washing machine appliances, and more particularly to washing machine appliances with filtration devices.

BACKGROUND OF THE INVENTION

Washing machine appliances generally include a cabinet with a wash tub and a wash basket rotatably mounted therein. Articles are typically placed inside the wash basket, and the washing machine appliance has a controller to direct the addition of water and detergent to the wash basket and to direct the washing of articles by the use of rotational force combined with the water and detergent. The articles are often further rinsed with water again added to the wash basket, and then wrung out by spinning the wash basket at a high speed. Each of these cycles, washing, rinsing, and spinning, generates waste wash water that is directed by the controller to be drained, usually into residential plumbing and municipal water systems.

The process of washing articles in a wash basket may generate a loss of stray fibers from the articles being washed. These stray fibers often leave with the waste wash water from the wash basket of the washing machine and drain into municipal and residential plumbing networks. There is a growing concern that when the stray fibers are synthetic, the stray fibers do not decay like natural fibers, but remain in the water system. Many municipal water systems are ill equipped to filter all synthetic fibers, and such synthetic fibers may be at risk of ending up in the general waterways of the Earth, wildlife ecosystems, or other undesirable locations.

Thus, there is a growing desire to filter waste wash water to capture more of the synthetic fibers before they enter residential and municipal water networks. Nevertheless, adding such filters to a washing machine appliance present various problems. For instance, adding a filter to the drain plumbing of washing machine appliances are challenging due to space requirements relative to the other parts already engineered into the washing machine appliance. Modifying a washing machine appliance to have an internal filter may be a costly process, as the filter may require other parts of the washing machine appliance to be moved, resized, or engineered in other ways to fit the filter into the washing machine. Additionally or alternatively, the filters may become clogged, preventing the washing machine appliance from being able to drain, which may cause the washing machine to be unable to complete a washing cycle. Further additionally or alternatively, filtering may not be needed for all washing machine cycles, as natural fibers are not known to enter wildlife ecosystems or human food supplies in the same manner as synthetic fibers and are generally deemed safe to remain in waste wash water.

Accordingly, a washing machine appliance with the ability to filter synthetic fibers out of waste wash water before the waste wash water is drained into municipal water systems may be desirable. A washing machine appliance that was able to filter synthetic fibers out of waste wash water without redesigning other parts or placement of parts within the washing machine appliance may be useful.

BRIEF DESCRIPTION OF THE INVENTION

Aspects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.

In one exemplary aspect of the present disclosure, a washing machine appliance is provided. The washing machine appliance may include a cabinet, a wash tub positioned within the cabinet, at least one pump in fluid communication with the wash tub, and a dual drain path connected to the at least one pump. The dual drain path may include a first drain path from the at least one pump, an unfiltered second drain path from the at least one pump in fluid parallel to the first drain path, and a water filter located along the first drain path.

In another exemplary aspect of the present disclosure, a washing machine appliance is provided. The washing machine appliance may include a cabinet, a wash tub positioned within the cabinet, at least one pump in fluid communication with the wash tub, and a dual drain path connected to the at least one pump. The dual drain path may include a first drain path from the at least one pump, an unfiltered second drain path from the at least one pump in fluid parallel to the first drain path, and a water filter located along the first drain path and disposed outside the cabinet. The washing machine appliance may further include a controller in operative communication with the at least one pump and the wash tub. During use, the controller may initiate a drain cycle. The drain cycle may include receiving an input for drain path selection corresponding to the first drain path or the unfiltered second drain path and directing wash fluid to a selected drain path of the dual drain path based on the received input.

These and other features, aspects and advantages of the present invention will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

A full and enabling disclosure of the present invention, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures.

FIG. 1 provides a perspective view of a washing machine appliance according to exemplary embodiments of the present disclosure.

FIG. 2 provides a cross-sectional view of a washing machine appliance according to exemplary embodiments of the present disclosure.

FIG. 3 provides an exploded exemplary view of a dual drain path on an exemplary washing machine appliance according to exemplary embodiments of the present disclosure.

FIG. 4 provides a schematic view of a washing machine appliance having a pump and a diverter valve according to exemplary embodiments of the present disclosure.

FIG. 5 provides a schematic view of an exemplary front load washing machine appliance having two pumps in a manifold, the schematic showing fluid flow according to exemplary embodiments of the present disclosure.

FIG. 6 provides a schematic view of an exemplary top load washing machine appliance having two pumps in a manifold, the schematic showing fluid flow according to exemplary embodiments of the present disclosure.

FIG. 7 provides a schematic view of a washing machine appliance having two pumps, the schematic showing fluid flow according to exemplary embodiments of the present disclosure.

FIG. 8 provides a schematic view of a washing machine appliance with a filter disposed on a cabinet according to exemplary embodiments of the present disclosure.

FIG. 9 provides a rear view of the exemplary washing machine of FIG. 8 .

FIG. 10 provides a schematic view of a washing machine appliance with a filter disposed within a cabinet according to exemplary embodiments of the present disclosure.

FIG. 11 provides a rear view of the exemplary washing machine of FIG. 10 .

Use of the same of similar reference numerals in the figures denotes the same or similar features unless the context indicates otherwise.

DETAILED DESCRIPTION

Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.

In order to aid understanding of this disclosure, several terms are defined below. The defined terms are understood to have meanings commonly recognized by persons of ordinary skill in the arts relevant to the present invention. The terms “includes” and “including” are intended to be inclusive in a manner similar to the term “comprising.” Similarly, the term “or” is generally intended to be inclusive (i.e., “A or B” is intended to mean “A or B or both”). The terms “first,” “second,” and “third” may be used interchangeably to distinguish one element from another and are not intended to signify location or importance of the individual elements. Terms such as “inner” and “outer” refer to relative directions with respect to the interior and exterior of the washing machine appliance, and in particular the wash basket therein. For example, “inner” or “inward” refers to the direction towards the interior of the washing machine appliance. Terms such as “left,” “right,” “front,” “back,” “top,” or “bottom” are used with reference to the perspective of a user accessing the washing machine appliance. For example, a user stands in front of the washing machine appliance to open the door and reaches into the wash basket to access items therein. Furthermore, it should be appreciated that as used herein, terms of approximation, such as “approximately,” “substantially,” or “about,” refer to being within ten percent greater or less than the stated value. When used in the context of an angle or direction, such terms include within ten degrees greater or less than the stated angle or direction. For example, “generally vertical” includes directions within ten degrees of vertical in any direction, e.g., clockwise or counterclockwise.

Referring now to the figures, FIG. 1 is a perspective view of an exemplary horizontal axis washing machine appliance 100 and FIG. 2 is a side cross-sectional view of washing machine appliance 100. As illustrated, washing machine appliance 100 generally defines a vertical direction V, a lateral direction L, and a transverse direction T, each of which is mutually perpendicular, such that an orthogonal coordinate system is generally defined. Washing machine appliance 100 includes a cabinet 102 that extends between a top 104 and a bottom 106 along the vertical direction V, between a left side 108 and a right side 110 along the lateral direction L, and between a front 112 and a rear 114 along the transverse direction T.

Referring to FIG. 2 , a wash tub 120 is positioned within cabinet 102 and is generally configured for retaining wash fluids during an operating cycle. As used herein, “wash fluid” or “cleaning fluid” may refer to water, detergent, fabric softener, bleach, or any other suitable wash additive or combination thereof. As used herein, “drain fluid” may refer to water, detergent, fabric softener, water with synthetic fibers, water without synthetic fibers, bleach, or any other suitable wash additive or combination thereof. Including waste wash water, with the additional understanding that “drain fluid” is fluid (e.g., liquid) designated for drainage out of washing machine appliance 100. A wash basket 122 is received within wash tub 120 and defines a wash chamber 124 that is configured for receipt of articles for washing. More specifically, wash basket 122 is rotatably mounted within wash tub 120 such that it is rotatable about an axis of rotation AR. According to the illustrated embodiment, the axis of rotation is substantially parallel to the transverse direction T. In this regard, washing machine appliance 100 is generally referred to as a “horizontal axis” or “front load” washing machine appliance 100. However, it should be appreciated that aspects of the present subject matter may be used within the context of a vertical axis or top load washing machine appliance as well.

Wash basket 122 may define one or more agitator features that extend into wash chamber 124 to assist in agitation and cleaning articles disposed within wash chamber 124 during operation of washing machine appliance 100. For example, as illustrated in FIG. 2 , a plurality of ribs 126 extends from wash basket 122 into wash chamber 124. In this manner, for example, ribs 126 may lift articles disposed in wash basket 122 during rotation of wash basket 122.

Washing machine appliance 100 includes a drive assembly 128 which is coupled to wash tub 120 and is generally configured for rotating wash basket 122 during operation, e.g., such as during an agitation or spin cycle. More specifically, as best illustrated in FIG. 2 , drive assembly 128 may include a motor assembly 130 that is in mechanical communication with wash basket 122 to selectively rotate wash basket 122 (e.g., during an agitation or a rinse cycle of washing machine appliance 100). According to the illustrated embodiment, motor assembly 130 is a pancake motor. However, it should be appreciated that any suitable type, size, or configuration of motors may be used to rotate wash basket 122 according to alternative embodiments. In addition, drive assembly 128 may include any other suitable number, types, and configurations of support bearings or drive mechanisms.

Referring generally to FIGS. 1 and 2 , cabinet 102 also includes a front panel 140 that defines an opening 142 that permits user access to wash basket 122. More specifically, washing machine appliance 100 includes a door 144 that is positioned over opening 142 and is rotatably, e.g., pivotably, mounted to front panel 140 (e.g., about a door axis that is substantially parallel to the vertical direction V). In this manner, door 144 permits selective access to opening 142 by being movable between an open position (not shown) facilitating access to a wash tub 120 and a closed position (FIG. 1 ) prohibiting access to wash tub 120.

In some embodiments, a window 146 in door 144 permits viewing of wash basket 122 when door 144 is in the closed position (e.g., during operation of washing machine appliance 100). Door 144 also includes a handle (not shown) that, for example, a user may pull when opening and closing door 144. Further, although door 144 is illustrated as mounted to front panel 140, it should be appreciated that door 144 may be mounted to another side of cabinet 102 or any other suitable support according to alternative embodiments.

Referring again to FIG. 2 , wash basket 122 also defines a plurality of perforations 152 in order to facilitate fluid communication between an interior of wash basket 122 and wash tub 120. A sump 154 is defined by wash tub 120 at a bottom of wash tub 120 along the vertical direction V. Thus, sump 154 is configured for receipt of, and generally collects, wash fluid during operation of washing machine appliance 100. For example, during operation of washing machine appliance 100, wash fluid may be urged (e.g., by gravity) from wash basket 122 to sump 154 through the plurality of perforations 152. A pump assembly 156 is located beneath wash tub 120 for gravity assisted flow when draining wash tub 120 (e.g., via an internal drain 158). Optionally, pump assembly 156 is also configured for recirculating wash fluid within wash tub 120. Accordingly, pump assembly 156 may also be referred to or include a drain pump or a circulation pump.

In some embodiments, the pump assembly 156 is located beneath wash tub 120. Additionally or alternatively, pump assembly 156 may be in fluid communication with sump 154 for periodically discharging soiled wash fluid from washing machine appliance 100. Pump assembly 156 may generally include a drain pump (e.g., drain pump 220) which is in fluid communication with sump 154 and with an external drain 148 through a drain path 150. During a drain cycle, drain pump 220 in pump assembly 156 urges a flow of wash fluid from sump 154, through drain path 150, and to external drain 148. Drain path 150, pump assembly 156, and external drain 148 will be discussed in more detail below.

Referring still to FIGS. 1 and 2 , in some embodiments, washing machine appliance 100 may include an additive dispenser or spout 170. For example, spout 170 may be in fluid communication with a water supply 160 in order to direct fluid (e.g., clean water) into wash tub 120. A water supply valve 162 directs flow of water from water supply 160 to spout 170. Spout 170 may also be in fluid communication with the sump 154. For example, pump assembly 156 may direct wash fluid disposed in sump 154 to spout 170 in order to circulate wash fluid in wash tub 120.

As illustrated, a detergent drawer 172 may be slidably mounted within front panel 140. Detergent drawer 172 receives a wash additive (e.g., detergent, fabric softener, bleach, or any other suitable liquid or powder) and directs the fluid additive to wash chamber 124 during operation of washing machine appliance 100. According to the illustrated embodiment, detergent drawer 172 may also be fluidly coupled to spout 170 to facilitate the complete and accurate dispensing of wash additive.

In some embodiments, an optional bulk reservoir 174 may be disposed within cabinet 102. Bulk reservoir 174 may be configured for receipt of fluid additive for use during operation of washing machine appliance 100. Moreover, bulk reservoir 174 may be sized such that a volume of fluid additive sufficient for a plurality or multitude of wash cycles of washing machine appliance 100 (e.g., five, ten, twenty, fifty, or any other suitable number of wash cycles) may fill bulk reservoir 174. Thus, for example, a user can fill bulk reservoir 174 with fluid additive and operate washing machine appliance 100 for a plurality of wash cycles without refilling bulk reservoir 174 with fluid additive. A reservoir pump 176 may be configured for selective delivery of the fluid additive from bulk reservoir 174 to wash tub 120.

A control panel 180 including a plurality of input selectors 182 may be coupled to front panel 140. Control panel 180 and input selectors 182 collectively form a user interface input for operator selection of machine cycles and features. A display 184 of control panel 180 indicates selected features, operation mode, a countdown timer, or other items of interest to appliance users regarding operation.

Operation of washing machine appliance 100 is controlled by a processing device or a controller 186 that is operatively coupled to control panel 180 for user manipulation to select washing machine cycles and features. In response to user manipulation of control panel 180, controller 186 operates the various components of washing machine appliance 100 to execute selected machine cycles and features. Controller 186 may include a memory and microprocessor, such as a general or special purpose microprocessor operable to execute programming instructions or micro-control code associated with methods described herein. The memory may represent random access memory such as DRAM or read only memory such as ROM or FLASH. In one embodiment, the processor executes programming instructions stored in memory. The memory may be a separate component from the processor or may be included onboard within the processor. Alternatively, controller 186 may be constructed without using a microprocessor, e.g., using a combination of discrete analog or digital logic circuitry (such as switches, amplifiers, integrators, comparators, flip-flops, AND gates, and the like) to perform control functionality instead of relying upon software. Control panel 180 may be in communication with controller 186 via one or more signal lines or shared communication busses to provide signals to or receive signals from the controller 186.

In addition, the memory or memory devices of the controller 186 can store information or data accessible by the one or more processors, including instructions that can be executed by the one or more processors. It should be appreciated that the instructions can be software written in any suitable programming language or can be implemented in hardware. Additionally, or alternatively, the instructions can be executed logically or virtually using separate threads on one or more processors.

For example, controller 186 may be operable to execute programming instructions or micro-control code associated with an operating cycle of washing machine appliance 100. In this regard, the instructions may be software or any set of instructions that when executed by the processing device, cause the processing device to perform operations, such as running one or more software applications, displaying a user interface, receiving user input, processing user input, etc. Moreover, it should be noted that controller 186 as disclosed herein is capable of and may be operable to perform any methods, method steps, or portions of methods as disclosed herein. For example, in some embodiments, methods disclosed herein may be embodied in programming instructions stored in the memory and executed by controller 186. Controller 186 and operations controller 186 is operable to execute will be described in more detail below.

The memory devices may also store data that can be retrieved, manipulated, created, or stored by the one or more processors or portions of controller 186. The data can include, for instance, data to facilitate performance of methods described herein. The data can be stored locally (e.g., on controller 186) in one or more databases or may be split up so that the data is stored in multiple locations. In addition, or alternatively, the one or more database(s) can be connected to controller 186 through any suitable network(s), such as through a high bandwidth local area network (LAN) or wide area network (WAN). In this regard, for example, controller 186 may further include a communication module or interface that may be used to communicate with one or more other component(s) of washing machine appliance 100, controller 186, an external appliance controller, or any other suitable device, e.g., via any suitable communication lines or network(s) and using any suitable communication protocol. The communication interface can include any suitable components for interfacing with one or more network(s), including for example, transmitters, receivers, ports, controllers, antennas, or other suitable components.

In exemplary embodiments, during operation of washing machine appliance 100, laundry items are loaded into wash basket 122 through opening 142, and a wash operation is initiated through operator manipulation of input selectors 182. For example, a wash cycle may be initiated such that wash tub 120 is filled with water, detergent, or other fluid additives (e.g., via detergent drawer 172 or bulk reservoir 174). One or more valves (not shown) can be controlled by washing machine appliance 100 to provide for filling wash basket 122 to the appropriate level for the amount of articles being washed or rinsed. By way of example, once wash basket 122 is properly filled with fluid, the contents of wash basket 122 can be agitated (e.g., with ribs 126) for an agitation phase of laundry items in wash basket 122. During the agitation phase, wash basket 122 may be motivated about the axis of rotation AR at a set speed (e.g., first speed or tumble speed). As wash basket 122 is rotated, articles within wash basket 122 may be lifted and permitted to drop therein.

After the agitation phase of the washing operation is completed, wash tub 120 can be drained, e.g., by drain pump assembly 156. Laundry articles can then be rinsed (e.g., through a rinse cycle) by again adding fluid to wash tub 120, depending on the particulars of the cleaning cycle selected by a user. Ribs 126 may again provide agitation within wash basket 122. One or more spin cycles may also be used. In particular, a spin cycle may be applied after the wash cycle or after the rinse cycle in order to wring wash fluid from the articles being washed. During a spin cycle, wash basket 122 is rotated at relatively high speeds. For instance, wash basket 122 may be rotated at one set speed (e.g., second speed or pre-plaster speed) before being rotated at another set speed (e.g., third speed or plaster speed). As would be understood, the pre-plaster speed may be greater than the tumble speed and the plaster speed may be greater than the pre-plaster speed. Moreover, agitation or tumbling of articles may be reduced as wash basket 122 increases its rotational velocity such that the plaster speed maintains the articles at a generally fixed position relative to wash basket 122. After articles disposed in wash basket 122 are cleaned (or the washing operation otherwise ends), a user can remove the articles from wash basket 122 (e.g., by opening door 144 and reaching into wash basket 122 through opening 142).

It should be appreciated that the present subject matter is not limited to any particular style, or model of washing machine appliance. The exemplary embodiment depicted in FIGS. 1 and 2 is simply provided for illustrative purposes only. While described in the context of a specific embodiment of horizontal axis washing machine appliance 100, it will be understood that horizontal axis washing machine appliance 100 is provided by way of example only. Other washing machine appliances having different configurations, different appearances, or different features may also be utilized with the present subject matter as well. For example, different locations may be provided for the user interface, different configurations may be provided, e.g., vertical axis washing machines, and other differences may be applied as well.

In certain exemplary aspects, the present invention provides a drain path that allows fluid drained from a washing machine appliance to be filtered or unfiltered based on one or more factors, such as the presence of synthetic fibers in the fluid to be drained, availability of a filter, or user preference. Drain path may be a dual drain path (i.e., configuration understood to have two or more paths through which liquids may be selectively drained) in some embodiments. Embodiments disclosed herein allow a controller (e.g., controller 186) to determine which drain path in the dual drain path to use. Additional exemplary aspects of the present invention are set forth, or will be apparent from, the description that follows of an exemplary embodiment of drain path 150.

Turning to FIGS. 2 through 10 , washing machine appliance 100 includes a water filter 200. Water filter 200 is located along drain path 150. In the illustrated embodiments, drain path 150 is a dual drain path with a first drain path 212 and an unfiltered second drain path 214. Water filter 200 is located along first drain path 212. Water filter 200 is located downstream of pump assembly 156. Water filter 200 is located upstream of external drain 148.

Water filter 200 has a water filter inlet 256. Water filter inlet 256 thus accepts drain fluid for filtering through water filter 200. Water filter 200 further includes a water filter outlet 258, which may allow filtered drain fluid to flow out of water filter 200 and toward external drain 148.

Water filter 200 includes a filter medium 240. In some embodiments, filter medium 240 includes or is formed from a synthetic fiber filtering medium for filtering synthetic or microfiber particles. Filter medium 240 may be configured to filter out synthetic fibers from drain fluid prior to drainage via external drain 148. In some embodiments, filter is configured to remove particles less than about 200 microns in length. In certain embodiments, filter medium is a cartridge, a non-woven felted material, a thin mesh, a set of plastic arms, a set of mesh plates, a mesh bag, or any other known filtering medium for filtering microplastics or synthetics from liquid, as known in the art.

Turning especially to FIGS. 2 and 4 , certain features of an exemplary embodiment will be described in detail. As shown, washing machine appliance 100 may include a common manifold 230. Common manifold 230 is connected (e.g., directly or indirectly) to sump 154 of wash tub 120. Common manifold 230 is in downstream fluid communication with wash tub 120. The common manifold 230 connects wash tub 120 to a pump 220. Furthermore, common manifold 230 is disposed in downstream fluid communication with wash tub 120.

Pump assembly 156 may include pump 220 housed in a pump housing 226 (e.g., within cabinet 102). Pump 220 is in fluid communication with common manifold 230. During use, pump 220 may be selectively activated to motivate drain fluid, including wash fluid and cleaning fluid that has been drained out of wash basket 122, into sump 154 along drain path 150 and to external drain 148. For instance, pump 220 may be in operative communication with controller 186 (e.g., to receive one or more signals therefrom). In turn, controller 186 may selectively direct activation or movement of pump 220 such that fluid is motivated from sump 154 to the exterior of cabinet 102 along drain path 150.

In certain embodiments, and as shown especially in FIG. 2 , pump 220 is attached to a diverter valve 232. Diverter valve 232 is connected to pump 220 at diverter valve inlet 231. For instance, diverter valve inlet 231 may be attached to a pump outlet 221. Diverter valve 232 and pump 220 are in fluid communication with one another such that fluid motivated by pump 220 flows into diverter valve 232 by way of diverter valve inlet 231. Diverter valve 232 further has a first side 234 of diverter valve 232 and a second side 236 of diverter valve 232. First side 234 of diverter valve 232 connects to first drain path 212. Second side 236 of diverter valve 232 connects to unfiltered second drain path 214.

When assembled, pump 220 is in fluid communication with water filter 200 and first drain path 212. In some embodiments, pump 220 is upstream of water filter 200 and first drain path 212. First drain path 212 includes water filter 200 within it. As shown, diverter valve 232 may be connected to pump 220 (e.g., at diverter valve inlet 231). During use, fluid may be directed to first side 234 of diverter valve 232 to be filtered along first drain path 212. In some embodiments, controller 186 directs or instructs diverter valve 232 to direct fluid to first side 234 of diverter valve 232 and to first drain path 212. For instance, this may be done by closing second side 236 of diverter valve 232 using a gate (not shown) within diverter valve 232, or as would be otherwise understood in light of the present disclosure.

Pump 220 may also be in fluid communication with unfiltered second drain path 214. In some embodiments, pump is upstream of unfiltered second drain path 214. Pump is further configured to motivate fluid from pump 220 towards unfiltered drain path 214. As shown pump 220 may be connected to diverter valve 232, (e.g., at second side 236 of diverter valve 232). During use, fluid may be directed to second side 236 of diverter valve 232 to be drained along unfiltered second drain path 214. In some embodiments, controller 186 directs or instructs diverter valve 232 to direct fluid to second side 236 of diverter valve 232 and to unfiltered second drain path 214. For instance, this may be done by closing first side 234 of diverter valve 232 using a gate (not shown) within diverter 232, or as would be otherwise understood in light of the present disclosure.

In certain embodiments, first drain path 212 extends from pump housing 226 by way of first side 234 of diverter valve 232. Additionally or alternatively, first drain path 212 may extend through water filter 200 and direct fluid toward unitary exit 242 by way of a drain manifold 250. In some embodiments, first drain path 212 includes a first drain line 206 and a second drain line 208 (e.g., formed by one or more suitable pipes or conduits). First drain line 206 is upstream of water filter200 and extends between pump 220 and water filter 200. Second line 208 is downstream of water filter 200 and extends towards external drain 148. First drain path 212 is configured to filter fluid including wash fluid or drain fluid using water filter 200 prior to draining fluid out of washing machine appliance 100 into external drain 148.

As shown, especially in FIGS. 2, 3, and 4 , with FIG. 3 showing an exploded view of drain path 150, first drain line 206 includes a first drain line inlet 260 and a first drain outlet 262. As shown, first drain line 206 extends from first drain line inlet 260 to first drain outlet 262. Generally, first drain inlet 260 is positioned downstream from diverter valve 232. In the embodiment shown, first drain line inlet 260 is directly connected to first side 234 of diverter valve 232. First drain outlet 262 generally connects first drain line 206 to water filter 200 at water filter inlet 256. In turn, first drain outlet 262 may be positioned upstream from water filter inlet 256. In the illustrated embodiment, first drain outlet 262 is directly connected to water filter inlet 256.

As noted above, first drain path 212 extends through water filter 200. Second drain line 208 may connect to water filter 200. Generally, second drain line 208 may extend from second drain line inlet 264 to second drain line outlet 266. In some embodiments, second drain line 208 connects to water filter 200 at a downstream location. For instance, second drain line 208 may connect to water filter 200 at water filter outlet 258 with second drain line inlet 264. In the illustrated embodiment, second drain line inlet 264 is directly connected to water filter outlet 258. Second drain line outlet 266 may be positioned upstream from drain manifold. Second drain line outlet 266 may be connected to drain manifold 250 at first manifold inlet 252. In the illustrated embodiment, second drain line outlet 266 is directly connected to first manifold inlet 252.

In some embodiments, drain manifold 250 is connected to a combined outlet 210. As shown, drain manifold 250 may extend from second manifold inlet 254 to drain manifold outlet 255. Combined outlet 210 may extend from combined line inlet 244 to unitary exit 242. Generally, combined outlet line 210 is positioned downstream from drain manifold 250. For instance, drain manifold outlet 255 may be upstream from a combined line inlet 244 of combined outlet line 210. In the illustrated embodiment, drain manifold outlet 255 is directly connected to combined line inlet 244 of combined outlet line 210. As shown, unitary exit 242 is in fluid communication with external drain 148. Unitary exit 242 is the exit point of drain path 150 and the discrete position where wash fluid (including drain fluid) from wash basket 122 exits washing machine appliance 100 into external drain 148.

During use, unitary exit 242 may generally permit wash fluid to exit washing machine appliance 100. In some embodiments, unitary exit 242 is connected to first drain path 212.

According to the arrangement of first drain path 212, fluid to flow from pump assembly 156 may be directed through first drain line inlet 260, through first drain line 206, and out first drain outlet 262. Fluid may then be directed through water filter inlet 256 and through water filter 200. Subsequently, fluid flows through water filter outlet 258 and into second drain line inlet 264 and then through second drain line 208. First drain path 212 ends at second drain line outlet 266, where fluid may be directed to first manifold inlet 252 and into drain manifold 250. From drain manifold 250, fluid is directed to combined outlet line 210, through unitary exit 242, and out of washing machine appliance 100 into external drain 148.

Returning to the beginning of the drain path 150, fluid can also be selectively directed through unfiltered second drain path 214 (e.g., separate or alternately from fluid through first drain path 212). As shown, second drain path 214 may extend downstream from pump housing 226. For instance, second drain path 214 may extend from pump housing 226 by way of second side 236 of diverter valve 232. Additionally or alternatively, second drain path 214 may direct fluid toward unitary exit 242 by way of drain manifold 250. In some embodiments, second drain path 214 includes an unfiltered drain line 204. Second drain path 214 is configured drain fluid out of washing machine appliance 100 into external drain 148.

Unfiltered drain line 204 includes an unfiltered drain inlet 274 and an unfiltered drain outlet 276. Generally, unfiltered drain line 204 extends from unfiltered drain inlet 274 to unfiltered drain outlet 276. In the embodiment shown, unfiltered drain inlet 274 is directly connected to second side 236 of diverter valve 232. Unfiltered drain outlet 276 may connect unfiltered drain line 204 to drain manifold 250. For instance, unfiltered drain outlet 276 may connect unfiltered drain outlet 276 at second manifold inlet 254. In the illustrated embodiment, unfiltered drain outlet 276 is directly connected to second manifold inlet 254. During use, fluid from pump assembly 156 may be drained through unfiltered drain outlet 276 and out of washing machine appliance 100 into external drain 148.

In some embodiments, drain manifold 250 is connected to a combined outlet line 210. As shown, drain manifold outlet 255 may be directly connected to a combined line inlet 244 of combined outlet line 210. In the illustrated embodiment, drain manifold 250 extends from second manifold inlet 254 to drain manifold outlet 255. Combined outlet line 210 may extend from combined line inlet 244 to unitary exit 242. Generally, unitary exit 242 is in fluid communication with external drain 148. During use, unitary exit 242 permits wash fluid to exit washing machine appliance 100. As shown, unitary exit 242 is connected to first drain path 212 and to unfiltered second drain path 214. Unitary exit 242 is the exit point of drain path 150, and the discrete position where wash fluid (including drain fluid) from wash basket 122 exits washing machine appliance 100 into external drain 148.

During use, second drain path 214 may generally direct fluid to flow from pump assembly 156 through unfiltered drain inlet 274, and through unfiltered drain line 204 and out unfiltered drain outlet 276. In some embodiments, unfiltered second drain path 214 ends at unfiltered drain outlet 276. During use fluid is directed from unfiltered drain outlet 276 to second manifold inlet 254 and into drain manifold 250. As shown, fluid is then directed to combined outlet line 210, through unitary exit 242 and out of washing machine appliance 100 into external drain 148.

Turning now to FIGS. 5 and 6 , certain features of another exemplary embodiment will be described in detail. Except as otherwise indicated or necessitated by the below description, it is understood that the embodiment of FIGS. 5 and 6 may include one or more of the features described above with respect to the other exemplary embodiments. As shown, washing machine appliance 100 includes vertical wash tub 120 (FIG. 6 ) or front loading wash tub 120 (FIG. 5 ). It is again noted that embodiments described herein are useful for both top loading or vertical wash tub washing machine appliances and front loading washing machine appliances. Washing machine appliance 100 may include common manifold 230. Generally, common manifold 230 is in downstream fluid communication with wash tub 120. In some embodiments, common manifold 230 is connected to sump 154 of wash tub 120. In additional or alternative embodiments, the common manifold 230 connects wash tub 120 to at least one pump. In this embodiment, the at least one pump includes first pump 222 and second pump 224.

Pump assembly 156 may include a first pump 222 and a second pump 224, both pumps 222, 224 housed in pump housing 226 (e.g., within cabinet 102). Generally, pumps 222, 224 are in fluid communication with common manifold 230. As would be understood, pumps 222, 224 are configured to motivate drain fluid, including wash fluid and cleaning fluid that has been drained out of wash basket 122, into sump 154 along drain path 150 and to external drain 148 (e.g., separately or independent of each other). In some embodiments, pumps 222, 224 are in operative communication with controller 186 (e.g., to each receive one or more signals therefrom). In turn, controller 186 may selectively, independently, or alternately direct activation or movement of pumps 222, 224 such that fluid is motivated from sump 154 to the exterior of cabinet 102 along drain path 150. Directing activation may be such that one of pumps 222, 224 may run independently or alternately from the other pump of 222, 224 such that fluid may be directed towards one of first drain path 212 and second drain path 214. Generally, controller may direct fluids along one drain path at a time and may activate one pump at a time.

When assembled, first pump 222 is in fluid communication with water filter 200 and first drain path 212. For instance, first pump 222 may be upstream from water filter 200 or first drain path 212. In some embodiments, first pump 222 may be connected to first drain line. Optionally, first pump 222 may be directly connected to first drain line 206 (e.g., at first drain line inlet 260). Additionally or alternatively, pump housing 226 may include a first pump outlet 270 upstream from first drain path 212. In turn, first pump outlet 270 may direct fluid from pump housing 226 to first drain path 212. During use, fluid may be directed to first pump 222 to be filtered along first drain path 212. For instance, controller 186 may direct first pump 222 to motivate fluid to first drain path 212.

During use, second pump 224 is in fluid communication with unfiltered second drain path 214. As shown, pump 220 is directly connected to unfiltered drain line 204 (e.g., at unfiltered drain inlet 274). In some embodiments, pump housing 226 includes first pump outlet 270 and a second pump outlet 272. Generally, second pump outlet 272 may direct fluid from pump housing 226 to unfiltered second drain path 214. During use, fluid may be directed to second pump 224 to be drained along unfiltered second drain path 214. For instance, controller 186 directs second pump 224 to motivate fluid to unfiltered second drain path 214.

In certain embodiments, first drain path 212 extends from pump housing 226 by way of first pump 222. Additionally or alternatively, first drain path 212 may extend through water filter 200 and directs fluid toward unitary exit 242 by way of drain manifold 250. As in the embodiment shown in FIGS. 2, 3 and 4 , first drain path 212 includes first drain line 206 and second drain line 208. First drain line inlet 260 may be connected (e.g., directly) to first pump 222. In some such embodiments, first drain path 212 extends from first drain line inlet 260 as in FIGS. 2, 3, and 4 with water filter 200, second drain line 208, and drain manifold 250.

In certain embodiments, second drain path 214 extends from pump housing 226 by way of second pump 224 and directs fluid toward unitary exit 242 by way of drain manifold 250. As in the embodiment shown in FIGS. 2, 3 and 4 , first drain path 212 may include unfiltered drain line 204. Additionally or alternatively, unfiltered drain inlet 274 may be directly connected to second pump 224. In some such embodiments, unfiltered second drain path 214 extends from unfiltered drain inlet 274 as in FIGS. 2, 3, and 4 with unfiltered drain line 204 and drain manifold 250.

For the embodiment shown in FIGS. 5 and 6 , drain path 150 is as otherwise described in FIGS. 2, 3, and 4 , including connections, operative communication with controller 186, and exit through unitary exit 242 into external drain 148.

Turning now to FIG. 7 , certain features of yet another exemplary embodiment will be described in detail. Except as otherwise indicated or necessitated by the below description, it is understood that the embodiment of FIG. 7 may include one or more of the features described above with respect to the other exemplary embodiments. As shown, washing machine appliance 100 may include vertically oriented wash tub 120, with the understanding that front load orientated wash tub may also be used according to embodiments described herein. Washing machine appliance 100 may include at least one pump (e.g., first pump 222 and second pump 224) connected (e.g., directly) to wash tub 120. In the illustrated embodiment, the at least one pump includes first pump 222 and second pump 224. First pump 222 is connected to wash tub 120 at a discrete position vertically below wash tub 120. Second pump 224 is connected to wash tub 120 at a discrete position vertically below wash tub 120 and separate or horizontally spaced from the position of first pump 222. First pump 222 and second pump 224 may each be housed in their own pump assembly (not shown).

In certain embodiments, first drain path 212 extends from first pump 222, through water filter 200, and directs fluid toward unitary exit 242 by way of drain manifold 250. As in the embodiment shown in FIGS. 2, 3 and 4 , first drain path 212 includes first drain line 206 and second drain line 208. First drain line inlet 260 may be connected to first pump 222. In some such embodiments, first drain path 212 extends from first drain line inlet 260 as in FIGS. 2, 3, and 4 with water filter 200, second drain line 208, and drain manifold 250. Additionally or alternatively, first drain line inlet 260 may be connected to first pump 222 by way of a first pump assembly outlet (not shown).

In certain embodiments, second drain path 214 extends from second pump 224 and directs fluid toward unitary exit 242 by way of drain manifold 250. As in the embodiment shown in FIGS. 2, 3 and 4 , second drain path 214 includes unfiltered drain line 204. Additionally or alternatively, unfiltered drain inlet 274 may be connected to second pump 224. Furthermore, unfiltered second drain path 214 may extend from unfiltered drain inlet 274 as in FIGS. 2, 3, and 4 with unfiltered drain line 204 and drain manifold 250. In some such embodiments, unfiltered drain inlet 274 is connected to second pump 224 by way of a second pump assembly outlet (not shown).

For the embodiment shown in FIGS. 5 and 6 , drain path 150 is as otherwise described in FIGS. 2, 3, and 4 , including connections and exit through unitary exit 242 into external drain 148.

Turning now to FIGS. 8 and 9 , certain features of yet another exemplary embodiment will be described in detail. Except as otherwise indicated or necessitated by the below description, it is understood that the embodiment of FIGS. 8 and 9 may include one or more of the features described above with respect to the other exemplary embodiments. As shown, washing machine appliance 100 may include water filter 200. Water filter 200 may be attached to cabinet 102. As shown in FIGS. 8 and 9 , water filter 200 is attached to back 114 of cabinet 102. Though shown with pumps 222, and 224, drain path 150 may otherwise extend from pump housing 226, pump assembly 156, or pumps 222, 224 as described above in the above embodiments. As shown in FIG. 8 , drain path 150 extends from pump assembly 156, with first drain path 212 including water filter 200, first drain line 206 and second drain line 208, and second drain path 214 including unfiltered drain line 204.

Turning now to FIGS. 10 and 11 , certain features of yet another exemplary embodiment will be described in detail. Except as otherwise indicated or necessitated by the below description, it is understood that the embodiment of FIGS. 10 and 11 may include one or more of the features described above with respect to the other exemplary embodiments. As shown, washing machine appliance 100 may include water filter 200. Water filter 200 may be internal to cabinet 102. As shown in FIGS. 10 and 11 , water filter 200 is attached internal to cabinet 102 with a filter hatch 280 providing external access to water filter 200. Though shown with pumps 222, and 224, drain path 150 may otherwise extend from pump housing 226, pump assembly 156, or pumps 222, 224 as described above in the above embodiments.

First drain path 212 includes water filter 200, first drain line 206 and second drain line 208. First drain line 206 is internal to cabinet 102 in these embodiments. Second drain line 208 is located at least partially external to cabinet 102 in these embodiments. Second drain line 208 exits cabinet 102 at a drain outlet hole 282 defined by back 114. Unfiltered drain line 204 exits cabinet 102 at an unfiltered drain outlet hole 282, also defined by back 114. Drain outlet hole 282 is at a discrete position separate from unfiltered drain hole 284. Filter hatch 280 is located on an external surface of cabinet 102 (e.g., rear 114), and allows access to filtering medium 240 for replacement or cleaning of filtering medium 240, as needed.

Drain path 150 may otherwise extend from pump housing 226, pump assembly 156, or pumps 222, 224 as described above in the above embodiments. As shown in FIG. 8 , drain path 150 extends from pump assembly 156, with first drain path 212 including water filter 200, first drain line 206 and second drain line 208, and second drain path 214 including unfiltered drain line 204.

In some embodiments, water filter 200 and second drain line 208 may be vertically above external drain 148. In certain embodiments, second drain line 208 may be angled at a non-zero angle downward from water filter outlet 258 to first manifold inlet 252. During use, fluid within second drain line 208 may thus be gravity directed from water filter 200 toward external drain 148. Additionally or alternatively, drain manifold 250 and combined outlet line 210 may be vertically above external drain 148, and below second drain line 208 and water filter 200 to aid in gravity direction of fluids from water filter 200 to external drain 148. In optional embodiments, water filter inlet 256 is disposed vertically above water filter outlet 258. During use, fluid entering water filter 200 at water filter inlet 256 may thus be gravity directed through water filter 200 (e.g., through filter medium 240) and out water filter outlet 258. Gravity directed fluid from water filter 200 toward external drain 148 may advantageously aid in lessening stagnant water present in drain path 150, lessening microbial growth, reduced siphoning of filtered water back through water filter 200, or less water in water filter 200 in between washing machine appliance usage.

Returning generally to FIGS. 1 through 11 , controller 186 may be configured to initiate a drain cycle. Generally, the drain cycle may evaluate a load of articles within wash tub 120 for synthetic fibers. In some embodiments, the drain cycle includes detecting the presence of synthetic fibers within wash tub 120. Optionally, the drain cycle may further include directing fluid through first drain path 212 based on detecting synthetic fibers. Contrawise, the drain cycle may include detecting the absence of synthetic fibers within wash tub 120. Optionally, the drain cycle may include directing fluid through unfiltered second drain path 214 based on detecting the absence of synthetic fibers.

In additional or alternative embodiments, the drain cycle includes a clogged filter function. The drain cycle includes detecting an obstruction in water filter 200 and directing fluid through unfiltered second drain path 214 based on detecting the obstruction in water filter 200. For example, in some embodiments, a fluid level may be detected (e.g., by sensor) in either wash tub 120 or pump housing 226. Receipt of a lack of sufficient decline in fluid level over a set period of time following controller 186 directing the flow of fluid into first drain path 212 by controller 186 may be a signal that water filter 200 is clogged. Controller 186 would then direct a flow of fluid into unfiltered second drain path 214. In certain embodiments, controller 186 may have a change filter function, wherein a predetermined timer is set by controller 186 upon receipt of an indication of a new filter medium in water filter 200, and when the predetermined timer's time is up, water filter 200 is assumed to be clogged or nonfunctioning, and controller 186 directs fluid into unfiltered second drain path 214. Other equivalent methods and systems of performing a clogged filter function may also be used in some embodiments.

In some embodiments, drain cycle includes receiving an indication that synthetic fibers are present in cleaning fluid of washing machine appliance 100 and selecting first drain path 212 to drain the cleaning fluid through water filter 200.

Detection the presence or absence of synthetic fibers may be performed in many ways, as known in the art, including detecting a set rotational speed of wash basket, detecting a change in rotational speed of wash basket, sensors, monitors, and user indication on control panel 180 of the presence of synthetic fibers in wash basket 122.

In some embodiments, controller is configured to initiate a drain cycle, the drain cycle including receiving an input for drain path, the drain path selection corresponding to first drain path 212 or unfiltered second drain path 214 and directing wash fluid to a selected drain path of dual drain path 150 based on the received input. In some embodiments, receiving an input for drain path is includes receiving an input signal from a user interface, (e.g., control panel 180 and input selectors 182), such as in response to user engagement with user interface. In some embodiments, receiving an input for drain path includes receiving a signal detecting the presence or absence of synthetic fibers in wash tub 120.

As depicted herein, FIGS. 1 through 11 alternate between a front load washing machine appliance 100 (FIGS. 1, 2, 4, 5, 8 through 11 ) and a top load washing machine appliance 100 (FIGS. 6, 7 ). It is noted that different configurations of washing machine appliances as described herein are envisioned by this disclosure, and the use of one or the other in FIGS. 1 through 11 is in no way intended to be limiting different configurations to one type of washing machine or another. As described herein, features described may be applicable to both or either type of washing machine appliance, or other equivalent washing machine appliance, including combination washing and drying appliances, without limitation.

This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims. 

What is claimed is:
 1. A washing machine appliance, the washing machine appliance comprising: a cabinet; a wash tub positioned within the cabinet; at least one pump in fluid communication with the wash tub; and a dual drain path connected to the at least one pump, comprising a first drain path from the at least one pump, an unfiltered second drain path from the at least one pump in fluid parallel to the first drain path, and a water filter located along the first drain path.
 2. The washing machine appliance of claim 1, the at least one pump comprising a first pump and a second pump, the first pump in fluid communication with the first drain path and the second pump in fluid communication with the unfiltered second drain path.
 3. The washing machine appliance of claim 2, further comprising a common manifold disposed in downstream fluid communication the wash tub, wherein the first pump and the second pump are connected to the wash tub through the common manifold.
 4. The washing machine appliance of claim 1, the at least one pump comprising a pump connected to a diverter valve, wherein the first drain path is connected to a first side of the diverter valve and the unfiltered second drain path is connected to a second side of the diverter valve.
 5. The washing machine appliance of claim 1, wherein the water filter is disposed outside the cabinet.
 6. The washing machine appliance of claim 1, wherein the water filter further comprises a synthetic fiber filtering medium.
 7. The washing machine appliance of claim 1, wherein the first drain path and the unfiltered second drain path are connected to a unitary exit, the unitary exit permitting wash fluid to exit the washing machine appliance.
 8. The washing machine appliance of claim 1, wherein the water filter is disposed within the cabinet, the cabinet further comprising a filter hatch, the water filter attached to the filter hatch, the filter hatch permitting access to the water filter.
 9. The washing machine appliance of claim 1, further comprising: a controller in operative communication with the at least one pump, the controller being configured to initiate a drain cycle comprising detecting synthetic fibers within the wash tub, and directing drain fluid through the first drain path based on detecting synthetic fibers.
 10. The washing machine appliance of claim 1, further comprising: a controller in operative communication with the at least one pump, the controller being configured to initiate a drain cycle comprising detecting the absence of synthetic fibers within the wash tub, and directing fluid through the unfiltered second drain path based on detecting the absence of synthetic fibers.
 11. The washing machine appliance of claim 1, further comprising: a controller in operative communication with the at least one pump, the controller being configured to initiate a drain cycle comprising: detecting an obstruction in the water filter, and directing fluid through the unfiltered second drain path based on detecting the obstruction in the water filter.
 12. The washing machine appliance of claim 1, further comprising: a user interface and a controller in operative communication with the at least one pump and the user interface, the controller being configured to initiate a drain cycle comprising: receiving an input for drain path selection from a user interface, the drain path selection corresponding to the first drain path or the unfiltered second drain path, and directing wash fluid to a selected drain path of the dual drain path based on the received input.
 13. The washing machine appliance of claim 3, the washing machine appliance further comprising a drain manifold, the drain manifold comprising a first manifold inlet, the first pump further comprising a first pump outlet, the water filter further comprising a water filter inlet and a water filter outlet, the first drain path further comprising a first drain line and a second drain line, the first drain line comprising a first drain line inlet and a first drain line outlet, and the second drain line comprising a second drain line inlet and a second drain line outlet, wherein the first drain line is connected to the first pump outlet at the first drain line inlet and connected to the water filter inlet at the first drain line outlet, wherein the second drain line is connected to water filter outlet at the second drain line inlet and to the first manifold inlet at the second drain line outlet.
 14. The washing machine appliance of claim 13, the drain manifold further comprising a second manifold inlet, the second pump further comprising a second pump outlet, and the unfiltered second drain path further comprising an unfiltered drain line, the unfiltered drain line comprising an unfiltered drain inlet and an unfiltered drain outlet, wherein the unfiltered drain line is connected to the second pump outlet at the unfiltered drain inlet and connected to the second manifold inlet at the unfiltered drain outlet.
 15. A washing machine appliance, the washing machine appliance comprising: a cabinet; a wash tub positioned within the cabinet; at least one pump in fluid communication with the wash tub; a dual drain path connected to the at least one pump, comprising a first drain path from the at least one pump, an unfiltered second drain path from the at least one pump in fluid parallel to the first drain path, and a water filter located along the first drain path and disposed outside the cabinet; and a controller in operative communication with the at least one pump, and the wash tub, the controller configured to initiate a drain cycle, the drain cycle comprising receiving an input for drain path selection corresponding to the first drain path or the unfiltered second drain path, and directing wash fluid to a selected drain path of the dual drain path based on the received input.
 16. The washing machine appliance of claim 15, the at least one pump comprising a first pump and a second pump physically connected by a common manifold, the first pump in fluid communication with the first drain path and the second pump in fluid communication with the unfiltered second drain path.
 17. The washing machine appliance of claim 16, wherein the common manifold is disposed in downstream fluid communication with the wash tub, and wherein the first pump and the second pump are connected to the wash tub through the common manifold.
 18. The washing machine appliance of claim 15, the drain cycle further comprising receiving an indication that synthetic fibers are present in a cleaning fluid of the washing machine appliance and selecting the first drain path to drain the cleaning fluid through the water filter. 